In Aiden's first onscreen appearance, he tells Freddy "A musical episode? How gay is that? Come on, this is the kind of desperate schlock you don't do til your fifth season!"
This is a subtle dig at other TV programs, who after entering their fifth season (or after shooting 100 episodes), tend to run out of ideas and create more outlandish storylines and episodes to keep the audience's attention. It also appears to be a tounge-in-cheek reference to Nip/Tuck (a show which has always had outrageous characters and storylines) entering its own fifth season with this episode.